A high-performance Mg-4.9Gd-3.2Y-1.1Zn-0.5Zr alloy via multidirectional forging after analyzing its compression behavior

作     者：Xiaojie Zhou Yuan Yao Jian Zhang Xiaomin Chen Weiying Huang Jing Pan Haoran Wang Maopeng Weng Xiaojie Zhou;Yuan Yao;Jian Zhang;Xiaomin Chen;Weiying Huang;Jing Pan;Haoran Wang;Maopeng Weng

作者机构：Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical EquipmentChangsha University of Science and TechnologyChangsha410114China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第70卷第11期

页      面：156-167页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financial support of the project from the National Natural Science Foundation of China(Nos.51904036 and 51874049) the Hunan Provincial Natural Science Foundation of China(No.2020JJ5600)。 

主　　题：Mg-Gd-Y-Zn-Zr Deformation behavior Activation energy Forge Dynamic recrystallization Mechanical properties 

摘      要：A high-performance Mg-4.9Gd-3.2Y-1.1Zn-0.5Zr alloy has been fabricated by multidirectional forging(MDF)after analyzing its compression behavior.The as-homogenized alloy exhibits a high activation energy Q of deformation(~285 kJ/mol).The size of DRXed grains after compression tends to decrease as the Z-H parameter(Z)increases,showing a grain size exponent m of~4.0.Lamellar LPSO phases,kinking deformation,and bimodal microstructure are detected at the relatively low compression temperature of 350 and 400℃,while sufficient DRX can be achieved at 500℃,accompanied by the dissolution of lamellar LPSO.According to the processing maps,MDF was successfully conducted under an appropriate condition.After peak-aged at 200℃for 78 h,the MDFed billet exhibits a tensile yield strength(TYS)of 331 and 305 MPa at room temperature and 200℃,respectively.The high strength mainly results from the combination of fine grains,low Schmid factor for basal slip,sufficientβ’ageing precipitates,and directionally arranged interdendritic LPSO phases,etc.This paper provides a feasible way for the fabrication of high-performance,low-RE-content,and large-scale Mg components for industrial production.